ROM and RAM
RAM: high-speed access, read and write times are equal, and independent of the address is the direct exchange of data with the internal memory CPU, also called main memory. It can be read at any time, and fast, usually as the operating system or other programs running in the temporary data storage media.
ROM: Read Only Memory for short, is a read-only memory. Its characteristic is that once record information it will not be able to changed or deleted. Usually it is used in an electronic or computer systems which do not need to constantly changing information , and data will not disappear because the power is turned off.
The difference between ROM and RAM
The RAM of network set-top box is equivalent to the computer’s memory bank,.we know that the greater the computer's memory, the faster speed of the computer (in theory say this, but the actual operating system and related systems could only identify 32 4G memory, 64-bit system can recognize more than 128G). However, if the computer or set-top box off, then the RAM memory of things released.
Then ROM of the set-top box is equivalent to the computer ROM drives, ROM that flash like a computer’s hard drive, as there are multiple sectors divided, respectively stores system files, user files, even if the computer (set-top box) shut down, ROM memory where the data will not be lost.
Summary
RAM is the machine’s running memory, its size affects the speed of the machine, while the ROM is the storage space provided by the machine, the size affects the available storage space for the macine’s users.
RAM is much more expensive than ROM , and the confinement by system, so the network’s memory is generally 512M or 1G, and ROM memory is generally 4G or 8G.
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